Another emotional situation, anger or frustration, can
make someone tear his hair — not a very good idea if he wants to look
nice for a date that evening. If he is really losing his temper, a friend might
tell him to keep calm and keep his hair on. He probably won't be very
pleased to be told that — in fact, it might even increase his fury.

Another nasty situation could arise if you insist on
split­ting hairs. This means arguing over small and trivial details — such
as whether you should have mustard or mint-sauce with your roast lamb for
lunch.

You might avoid a dangerous situation — an accident,
for example — by a hair's breadth, and that, as you might imagine, is a
very small distance.

If you let your hair down, you will behave in a
very free and uninhibited way — talking very frankly or dancing wildly at a
party, perhaps.